import java.util.Scanner;

public class Ex2_24{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		System.out.print("Enter v and a: ");
		double v = input.nextDouble();
		double a = input.nextDouble();
		double length = v * v / (2*a);
		System.out.printf("The minimum length for this airplane is %.3f\n", 
			length);
	}
}
